Delegate AppPredictor creation to a factory class

A scaffolding chnage that delegates AppPredictor instance creation to a
new factory class.
As we always create an AppPredictor instance for each available
profile, the creation logic is changed from lazy to eager.
As a collateral change, remvoe some obsolete flags.

Test: manual test
Test: atest IntentResolverUnitTests

Change-Id: I0cce89bce1fb39d39792263a3a490a074304afe3